Secchi Disks

Attach these disks to a calibrated line, and lower them into the water until they disappear from view to measure turbidity or calculate light extinction depth.

Polystyrene disks

Includes weight

To determine water color, use disks with the Forel-Ule Color Scale. The disks are made of polystyrene and the Oceanographic Secchi Disk includes a weight to facilitate lowering.

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